books.google.com - In recent years beekeepers have had to face tremendous challenges, from pests such as varroa and tracheal mites and from the mysterious but even more devastating phenomenon known as Colony Collapse Disorder (CCD). Yet in backyards and on rooftops all over the world, bees are being raised successfully,...https://books.google.com/books/about/Top_Bar_Beekeeping.html?id=AJerpypd9ncC&utm_source=gb-gplus-shareTop-Bar Beekeeping